Relationships of milk culture status at calving with somatic cell counts and milk production of dairy heifers during early lactation on a Californian dairy

John H. Kirk, Jim C. Wright, Steven L. Berry, James P. Reynolds, John Maas, Abbas Ahmadi

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Four-quarter, composite milk samples were collected from 339 heifers calving for the first time in a large Californian dairy which consistently had low herd somatic cell counts and low prevalence of major mastitis pathogens. The milk samples were collected on average at 6.4 days post partum (range 1-17). Thirty-nine percent of the heifers were subclinically infected with coagulase-negative Staphylococcus spp. Other results were: no growth, 29%; coliform only, 16%; Streptococcus spp. only, 11%; Streptococcus spp. and coagulase-negative Staphylococcus spp. only, 4%; others, 1%. The somatic cell counts and milk production were not significantly different (P > 0.05) between culture groups over the first five monthly Dairy Herd Improvement test periods. Somatic cell counts decreased significantly after the first test period within the Streptococcus spp. group (P < 0.002) and Staphylococcus spp. group (P < 0.01). Milk production was higher during most of the second and third test periods (P < 0.03) compared with the first period. The frequency of heifers lost to analysis was not different between the culture groups. Results from this dairy indicate that subclinical infections with minor pathogens (primarily coagulase-negative Staphylococcus spp.) had no significant effect on average somatic cell counts or milk production during early to middle lactation.

Original languageEnglish (US)
Pages (from-to)187-198
Number of pages12
JournalPreventive Veterinary Medicine
Volume28
Issue number3
DOIs
StatePublished - Sep 15 1996

Fingerprint

dairy heifers
early lactation
somatic cell count
Lactation
coagulase negative staphylococci
calving
milk production
dairies
Streptococcus
Milk
Staphylococcus
Cell Count
Coagulase
heifers
milk
herd improvement
pathogens
testing
dairy herds
Asymptomatic Infections

Keywords

  • Bacteriology
  • Early lactation
  • Heifers
  • Mastitis
  • Production
  • Somatic cell counts

ASJC Scopus subject areas

  • Food Animals
  • Animal Science and Zoology

Cite this

Relationships of milk culture status at calving with somatic cell counts and milk production of dairy heifers during early lactation on a Californian dairy. / Kirk, John H.; Wright, Jim C.; Berry, Steven L.; Reynolds, James P.; Maas, John; Ahmadi, Abbas.

In: Preventive Veterinary Medicine, Vol. 28, No. 3, 15.09.1996, p. 187-198.

Research output: Contribution to journalArticle

Kirk, John H. ; Wright, Jim C. ; Berry, Steven L. ; Reynolds, James P. ; Maas, John ; Ahmadi, Abbas. / Relationships of milk culture status at calving with somatic cell counts and milk production of dairy heifers during early lactation on a Californian dairy. In: Preventive Veterinary Medicine. 1996 ; Vol. 28, No. 3. pp. 187-198.
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